Short-Term Investments - Maturities of Short-Term Investments (Detail) (USD $) In Thousands, unless otherwise specified	Jun. 27, 2014	Dec. 31, 2013
Investments, Debt and Equity Securities [Abstract]
Less than one year	$ 52,594	$ 55,278
Due in 1 - 2 years	22,644	24,974
Total short-term investments, Estimated Fair Value	$ 75,238	$ 80,252

Amount of debt securities categorized neither as held-to-maturity nor trading.

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